PI4IOE5V9555LEX Equivalent & Substitute Parts

Part Overview

The PI4IOE5V9555LEX is a 16-bit I/O expander manufactured by Diodes Incorporated, designed for I2C communication at 400 kHz. This interface IC operates across a wide supply voltage range of 2.3V to 5.5V and is housed in a 24-TSSOP surface mount package. The device is currently in active production status with interrupt output capability, making it suitable for applications requiring expanded digital I/O control via I2C protocol.

Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design requirements permit alternative solutions that meet the same functional and electrical specifications.

Substiute Parts

PI4IOE5V9555LEX

Diodes IncorporatedIn Stock: 3245PI4IOE5V9555LEX Datasheet

Current PartRFQ

XRA1201PIG24TR-F

MaxLinear, Inc.In Stock: 7937XRA1201PIG24TR-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PI4IOE5V9555LEX is determined by the following critical parameters:

• I/O Count: Must provide 16 I/O lines
• Interface Protocol: Must support I2C at 400 kHz minimum
• Package: Must be 24-TSSOP form factor for PCB compatibility
• Interrupt Capability: Must include interrupt output functionality
• Operating Temperature Range: Must cover -40°C to 85°C
• Surface Mount Compatibility: Must be suitable for surface mount assembly

The XRA1201PIG24TR-F meets all substitution criteria. While it supports both I2C and SMBus protocols (SMBus is backward compatible with I2C), operates at the same 400 kHz clock frequency, maintains the same 24-TSSOP package, and provides identical interrupt output capability, it operates within a narrower supply voltage range of 1.65V to 3.6V. This voltage difference requires design verification for applications utilizing the full 2.3V to 5.5V range of the primary part.

Parameter Comparison

Engineering Selection Recommendations

Both the PI4IOE5V9555LEX and XRA1201PIG24TR-F are active production devices with equivalent RoHS and moisture sensitivity compliance. Selection between these parts should be based on supply voltage requirements:

Use the PI4IOE5V9555LEX when the application requires operation across the full 2.3V to 5.5V supply range, particularly in systems utilizing 5V logic levels or requiring low-voltage operation below 1.65V.

Use the XRA1201PIG24TR-F when the application operates within the 1.65V to 3.6V range and SMBus protocol compatibility is beneficial. The open drain output type of the XRA1201PIG24TR-F provides additional flexibility for multi-master I2C configurations.

Both devices maintain identical I/O count, clock frequency, package form factor, and operating temperature specifications, ensuring functional equivalence within their respective voltage operating ranges.

Frequently Asked Questions (FAQ)

Q: Can the XRA1201PIG24TR-F replace the PI4IOE5V9555LEX in all applications?

A: Functional replacement is possible only in applications where the system supply voltage remains within 1.65V to 3.6V. Applications requiring operation at 2.3V below 1.65V or above 3.6V require the PI4IOE5V9555LEX.

Q: What is the significance of SMBus support in the XRA1201PIG24TR-F?

A: SMBus is a subset protocol of I2C and maintains backward compatibility. The XRA1201PIG24TR-F can operate in standard I2C mode, making it compatible with existing I2C bus architectures.

Q: Are the 24-TSSOP packages physically identical?

A: Yes. Both parts use the 24-TSSOP package with identical dimensions (0.173" width, 4.40mm). PCB footprints and assembly processes are interchangeable.

Q: What does "Open Drain" output type mean for the XRA1201PIG24TR-F?

A: Open drain output requires external pull-up resistors on the I/O lines. This configuration is standard for I2C applications and provides flexibility in multi-master systems.

Q: Do both parts have the same interrupt output capability?

A: Yes. Both the PI4IOE5V9555LEX and XRA1201PIG24TR-F include interrupt output functionality, enabling event-driven I/O monitoring.

Q: What is the moisture sensitivity level, and why is it important?

A: Both parts have MSL 1 (Unlimited), indicating they can be stored indefinitely without moisture absorption concerns. This simplifies inventory management and reduces handling restrictions.